The Land Bridge Theory

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1.
IceAge
2.
Bison
3.
WoolyMammoths
4.
Glacier
5.
Canada
6.
Kentucky
7.
SeaLevels
8.
Siberia
9.
Alaska
10.
Bering
11.
NativeAmericans
12.
Flood
13.
Fishing
14.
Hunting
15.
Gathering
16.
Agriculture
17.
Nomadic
18.
Corn
19.
Beans
20.
Squash